ARID1A and atrial fibrillation: When we did not exclude SNVs with AF less than 5% in the analysis of cfDNA and exoDNA, one stop-gain SNV in ARID1A (C1714T) with a somatic mutation frequency of 16.8% (58/345) was identified in cfDNA with the allele frequency of 1.8% (21/1177) and exoDNA with the AF of 3.4% (30/897).